Multivariate

• - Simple array of independent univariate PDFs (lazy product)
  - prod(f,*)
  'prod( norm(0,1) , unif(3,5,1) , ... )'

• - Multi-dimensional histogram for continuous data
  - hist( [l,r,s],* : p,* )
  'hist( [0 , 10 , 2] , [0 , 10 , 3] : 0.05, 0.02, ... )'

• - Multi-dimensional histogram for Continuous and discrete data
  - hist([l,r,c], a,*: p,*)
  'dist( 1,2,2, 2,3,4: 0.1, 0.2, 0.1, 0.1, 0.2, 0.2 )'

• - Multi-dimensional histogram for Categorical and discrete data
  - hist(c,*, a,*: p,*)
  'dist( 'red', 'blue', 2,3,4: 0.1, 0.2, 0.1, 0.1, 0.2, 0.2 )'